/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.naming.factory;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.RefAddr;
import javax.naming.Reference;
import javax.naming.spi.ObjectFactory;

import org.apache.naming.ResourceLinkRef;

/**
 * <p>
 * Object factory for resource links.
 * </p>
 * 
 * @author Remy Maucherat
 * @version $Revision: 467222 $ $Date: 2006-10-24 11:17:11 +0800 (星期二, 24 十月
 *          2006) $
 */

public class ResourceLinkFactory implements ObjectFactory {

	// ----------------------------------------------------------- Constructors

	// ------------------------------------------------------- Static Variables

	/**
	 * Global naming context.
	 */
	private static Context globalContext = null;

	// --------------------------------------------------------- Public Methods

	/**
	 * Set the global context (note: can only be used once).
	 * 
	 * @param newGlobalContext
	 *            new global context value
	 */
	public static void setGlobalContext(Context newGlobalContext) {
		if (globalContext != null)
			return;
		globalContext = newGlobalContext;
	}

	// -------------------------------------------------- ObjectFactory Methods

	/**
	 * Create a new DataSource instance.
	 * 
	 * @param obj
	 *            The reference object describing the DataSource
	 */
	public Object getObjectInstance(Object obj, Name name, Context nameCtx,
			Hashtable environment) throws NamingException {

		if (!(obj instanceof ResourceLinkRef))
			return null;

		// Can we process this request?
		Reference ref = (Reference) obj;

		String type = ref.getClassName();

		// Read the global ref addr
		String globalName = null;
		RefAddr refAddr = ref.get(ResourceLinkRef.GLOBALNAME);
		if (refAddr != null) {
			globalName = refAddr.getContent().toString();
			Object result = null;
			result = globalContext.lookup(globalName);
			// FIXME: Check type
			return result;
		}

		return (null);

	}

}
